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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792cae7e380781e2732053fe6a683245ba4b20dba90cbd2ded41b41b059d7a83' 
  AND token = 'veqlyq4zvLiF4ZmZEQB54fwpcp32ptQ5s7D5dvFXCDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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