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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc31e34a51aa837a81d0ecc71895f31b65b0e00db7ed064e893db4ce94c18152' 
  AND token = 'vO+1qqleYeq9E9EftX6kYQ214390fVwW/pYP5GF555g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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