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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c97c99261b2ccfd8343b4e678c79414cbbd29848809a47c95332190d900273f' 
  AND token = 'vU6bNCIwL3l1ot5w3mAZu6FKaytJTqLzXFIH6WFr/6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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