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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e97c468670daf578fa58248f6cf952d43f84950a3fa9ec723fd6edfc47f01a' 
  AND token = 'eoH6Mla60DHAYm3Glj0a0c8d45jowOIPzHz+1pbyKiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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