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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7f1b683fc08aec2f1215c8b438bfb8029d27ba877e493f8b65c5c4f3eb87fa' 
  AND token = 'jWrtSQvANv2HmFuBgdko8foE3g7tZ7HeGEUe2wHTRf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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