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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28259a9450c36a985045bfcdfb0f671222038932e8fdfaf724c234d0fdf4ec4a' 
  AND token = 'rWMT4BtS0knFDh7EW8GPx080NuSItIQYzJRZe8sJseU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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