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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd762406ac8a1666850fdb991223e443cc5329585b01cbb38a47b5da858770c5' 
  AND token = 'i6z1XAPfabLUb5OqE4eFLPX6H8Ejj5zDgEWYCJ3jzig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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