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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b33dec37e394d4c310194a7b8faf1fa70130118bbc078b30a842a531324d39d' 
  AND token = 'jj0Bk2g5wvWJapG46BJPFIAv9QiOcT5JgL3GTY+bkaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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