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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38551826825e343c4b61cc5fcd01a3a8c0243f5476ea32134780139cadf6802f' 
  AND token = 'qSNF+M8ZrnzS3GMcY+bl7KwqbdrfF76ZCDRqYeNRMUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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