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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6adc032fdb4ca228af69f6359368be01f352db8d5c741f2213c644cc58c57a' 
  AND token = 'JNefa5f6XvnAsIKxvwaLO2eFmQFTbUK11162zZ4sx0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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