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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af23c97fd60d89ab35f3be4f3b12333196f3b85eab4a9fead442eeb0a9c5877c' 
  AND token = 'thPXXpje0KqBTwH7dXoseViuAbnGEpK7AFcGoUqhO/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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