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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bb6ccab582259bb789271dc0eeb23599215a85fe3b354994933e86170ec8a6' 
  AND token = 'eYlWAIc0rg8IuJwqEt6WZ1xFfQ1TeaZJCr9DI3f6M0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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