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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904f6a8744d5fa7dacc3ab63dded07ba64f4bf88f8ddb1ac739eb031d33db95a' 
  AND token = 'TZxonDAFlpUZI+z1YJUArNh/DgVxPM+NR9vbtyc2mXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}