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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da67cce418ec2974e5ff8085e412c34c42d6690c719b9ba435f5656252f6117' 
  AND token = 'Xlo2d2S9QPxxZrq0dWjxO8gvyBkHV6197p6LVwxAAFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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