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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c87be5733e02bca81184e0dd14ec8449e19a35afd299aa9fd6a8db4b2e44bf' 
  AND token = '65Wg6gFMUc5vB4CqYu9AFN68BaKHcOUiC5qNFnxfwjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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