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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb946d44b8177dc5e29e061502e5707159a9362b7b999d463a7c4da67d5ea616' 
  AND token = '6yMj42DNVTCIOfQ7vsCV+WkIAXgi7KKjK1JlEpFAUEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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