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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343e6716a27bcf6944c757f1a88692d64dbb52f42f734b0a4e93d40c30fdc182' 
  AND token = 'eWib5qegUq31xmZYTpwQ5i5EgDbmrMQcGgVocCJN2VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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