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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e26809f83c1fa9622fec9719830708cae4d9113c34ca4b03c34ab1a2efa85a' 
  AND token = '36YDGANlwvYwFpH7h6ZWq3VxdTpmt/oEhM/uiBxy4bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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