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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72037b0a67b5eb7f37c1ebd3ce7bb91863c548581ca11bc642def7ec9521a3fa' 
  AND token = 'IjQ15TuCDiFn4RreT18gXzOWTb9YKVfDucNQhymFVSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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