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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd88402bbd6a5fd9c5873993d0ec8d5f3f5015f901254075e132951cf5597224' 
  AND token = '17+ctkkxgbA/VSgsEhXJaE2V1cNmLIgxsHOVyAZHtW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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