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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94517afebaa0d4fe7a89246d12f16a91df6362c8e32464a9e56f51c640aeb08a' 
  AND token = 'Y8b9JJK0MO+J1t/pEWUfCST+LaS7vbWGxJq72AD+eps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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