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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123135e91e805720a7acc6591ca4599487a0cb97416fe9e9d914b674b98c83da' 
  AND token = '4URdRmCkt7MXwJuCUy7mKzAURGA6GoLhXsQ6Zau6Qj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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