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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3019129dedcb8b856f00d23472d36ccefe4792c9140966c04f6daf7e5a415962' 
  AND token = 'P3tU3nLUtyjigx03p50JrsTlVIcudQ2VdhQ3Ugp9mXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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