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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddb6f5c0432c765ceb048e58595e9fa7a1628111691f0b0a183ec38dfbd3a56' 
  AND token = '6o5q92bDAiu7TlkCEW2UJSp6z5E1LOYc4DxfDZ0eGGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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