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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb4fae3028a21a89ccf0e874353b7730cd0ee44d77fc048d0d9fa5d6e0392e8' 
  AND token = 'q1c4FQ8Fb79QIZXRxI8VxCNSq11bMn+IGyqy/pLTq1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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