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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87393608c761e5e3c70bfc7eb409314c5bb536c81305cd50d688bb44682d0cbe' 
  AND token = '5kOz0wwZNoOMl9l87o1Gc6jYT7+5iLER/IzGeaANcr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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