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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf95bcd0b1128e943cff05032d90fe2e3f8ccb02495e541e98f6ea56e7a4222' 
  AND token = 's1p0gAq1Rf12b1HqGhyCSameWvo5QoHAN01KMbuTGxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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