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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e745e9ec35f45717a55d8c3bf4e54afed0ddad066b6e1fe6dfa6fa4d5c1795b' 
  AND token = 'kaQuYXUGiiHzvllvTRojFMRkC/h92HckVfalA96rIU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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