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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb735909086387be9abf55584d7405fb31787dad5ef643d77a5806eab3add4e' 
  AND token = 'RXt3Mii0bn+Ov5XUPQzLi3HSPHB+lsgrg5T+UyFrz9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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