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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4231b662df97ad0387893ef1688e7358ac3512883bbc0a9e3fd11bc86cd45cf' 
  AND token = 'zLmSId7yKQDHN98qwfn34u0mYZuwkj0Rwk++13Li8g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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