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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daddca359b77e0dec3b4cdaf6e73327fec7beea49198f900ee2c71f723e9915e' 
  AND token = 'AUKnoEUpFOwh8kozNnY+N8zcDP3iNvgf1cawLcdBM7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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