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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9808e60a9d256d79b5d7d999c329a8d4b5f354cd17db74dcb48ea25abf10ae87' 
  AND token = 'R5zO0sirI3/HwkISTVs1GG5ydOFYBTHYStgSyeBr86s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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