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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387f655b64cd3fd9548c32588895e3b92d58abf5f0ef1bb382ba58b563b88e01' 
  AND token = 'f01qgNQ0URf+zbj2+x3grx79Kpppbu8tmbZWTDmLOY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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