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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e3f8c450d078efe79d6e69664794e340835a6fc0ebad67bccdc94ede95a147' 
  AND token = 'qdG2PbcpER/K98m2KUoS0KhaAswwZi+DuJPX6uAAEG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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