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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58335e3b07de127a3f57084643c2e18eb726b66b73d04953e807e8074567a4f' 
  AND token = 'k3a6KuoR1+Rv2vIhB3MKuZHRI0ar5r0JnetGx0f1NaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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