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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4024b97f8030f5a1082495f3b2e548b1a4d9d3b59f9bc494d4b0e926ce93d1d' 
  AND token = 'boBpcrJ81+t8kdWBcP7jjs78GjWikdKFeGq+/wSJMmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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