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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c602bd743d7fd36658d4e8901c8d69b19fb11484009839840ad71d066645803' 
  AND token = 'ByS0fVeiRCJ1QVK4pM2yK2o2V7L0gkNwVzM2pG4GGHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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