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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ee8329b50bd9d748b3df94e99ff16c9f8df237b5c372b0fe9a0f3b0e8b628d' 
  AND token = '+psPG1OUJ62yWu2qfc/3FfSWgCb7czPk3nUpqXAy0JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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