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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cd77f62f6139fa7363dc45644604c9aad9d906b25ee78e32463150e4dd1a8b' 
  AND token = 'lKQjFjHFhR9jFBn4dfN7tzwPozwrX14hiOErUUs9Lk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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