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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70204833453a88ef7c28ddccd2e4b3caee77e2aed464392cd134bd46f23ad79' 
  AND token = 'vGefHYjh2IXX83en1ObeMXdxXjAGmWBO0H3j3D+/xtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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