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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6645b66da78d887fbbc90e1c4856795867b07e4c2ff836e67a2eab8ce57e777' 
  AND token = 'dP/+7El1ci2FakXKYtIp2umgzZlOc/kjh0gm4Ou347w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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