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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb0e3a07f10a7474cbdda77c82744e9999b3da1d42dd62effaf5b5c96b4cfa4' 
  AND token = 'gOOieswWWrza5QVE4Tiol361nyB9E+5CWrvtGWa84Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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