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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc0df970c42dec6f765d0c1fb880b15b1fcb9166f1be6e3fd08e44efa8ff021' 
  AND token = 'BMhwUTHR5CCZjNAeN1eLn8T2fn+bvibZBUDvE5cFlSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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