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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a60e9dfd5e78dbfeb7fb7353ee46474a9fead9d294222c928aa9d7573c8c6de' 
  AND token = 'gc4k7MlyXciXwJv4FD01yK0TmOc4tLkNuK48/DHuhhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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