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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4135d084d3d4956430e1e47728f4ad5b552b56731aa4e2d1bf8ffecf694f9151' 
  AND token = '0Jf9pRY+elBAGG1fkWgfDQ4apP75D/AKuTqu2ytX2hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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