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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb37cdbd087feccb58709c0e516b74c4a111d48d76ae2583fe5f831f8881975a' 
  AND token = 'JHJ0hZI6bNNJX2JkKD8YaHAeuI0oFGKZ9GTLcpMz8+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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