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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97aa761a400257daf127ad1d3daae0ec7d84389bdf427e4d8abc2fdf01c17f5' 
  AND token = 'q1c0Q2vgJNSpqRHwE8SCvVtO7xw+NQD5TpOTMQEey0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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