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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83369b1d513aa1549f09e84175c31735d1e32d29551d5930bc1dacc689c1ecf0' 
  AND token = 'Vdk03E6opzmG6BtfK///i0bQ/Q5w65ysuQZydj6eemY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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