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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fff7c6cbf34448f71d5239029aa764914c2db9990692a7a699401af589cf07' 
  AND token = '02MPBItGQ849BaqE5lWV9Z4oIIUKUnKQ8xb8EzzBYcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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