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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79d17ea25665f94b143fde77c20e0786820611ac22ce276a3b488ec0831d308' 
  AND token = 'Sg5U1vW0RqZO/RJVIXno74c7R9AEJlEIOWiezhIhTeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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