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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b42c29ccda7afff4df3be7fa724b185afe8c6ab9e018563ccd5c9fdf094c89b' 
  AND token = '336mOb8AxxRYHWfF8hY5ZWknyQ520Pyr9sAAGLHLQH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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