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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea953d76219f2194641b2a4c6382e2b9684bf9ea968e277a49d0f06f63d7a351' 
  AND token = 'l6VV1ZT1K437mDgFpIeXOuboC7801S7YwREWfk87gU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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