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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590ee5081c86e39451873f7cb0f725721b6b907348a3d2803fbe7430e4d41d6d' 
  AND token = 'G1Yhj8mm32fJcGcpQ/BOQb0dmAJu1Op77voOOH5+wek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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