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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ae59fa59bfef56ece604c1e626d26150fb626162d98f171c50fc4f61bbc4ab' 
  AND token = 'P0qVTQE/0wSogU1GUoOE3nwOsMKbQzkdH227alyyW24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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