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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cef6ea96f40d7642249fcefd7b60db53b6cd5e7cb6d2e2acf9aa0b51c7e537f' 
  AND token = '9hjI7k63urZxuex4pzrNFOM039vef7RsWMwrhSCCBnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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