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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf037e2e63b4b1aa54d75e2a1b52e00bc5c1038177744baf4457091c1f75c3c' 
  AND token = 'dWNiCPX8Ob2GlyW4t4e5YvwWHRty7U/h2heCSCY90iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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