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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0712437b687a2cd62fae95bf50d34b002d14d96ab0886b685305de7ba377ea' 
  AND token = 'OBFEZ43spaKUI4Uk7amZ88Hho0Mt7hO8Mo7hwDuwg4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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