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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac58e4620c04aeba5fb951839300eb111d272c549a04b332d3075cc51905c26d' 
  AND token = 'PKoq8FV3QgsQBqbFBTto7qFyBPJzYb2rag1tQ1Yt4ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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