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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5129075ee0b41bf8c9411f7da66fae59c047823cd2ba0c307ef0c37ebfa558f7' 
  AND token = '6Eax8Y+vJ8YbjevFPUAHvP2aACBsnFSCS1OU3OlxnGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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