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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1c763d22cb44039784e7cab3377c86b90a7518a3ea67c0ac778f0e4c0beaeb' 
  AND token = 'jVabCUrZygC/2hFUGYzv53JpXL0kj/xRG7l9iNRp5JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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