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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3263508c59c3883363003465ff6704f4ff767b330d58c14bad952a66bcd58c' 
  AND token = 'B3EKpYtvxIRbjIEv9yUPRM2hHzhSE3dH3ffGsrwUwB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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