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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d056183528982454045068282f793d064ce3c14eb29e0900c12ae52bf5f1b63' 
  AND token = 'x9uoL4Ue0U27DypVzuhOn8s4fZ7CSfmh3Jsq9aKpvF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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