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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308384af71fa54c5840bcb774e46a77ed48f991dc6b9d3f03f73c9324b69e048' 
  AND token = 'p7E1AzTYBueVNoxA2errJ6mivbWNRjjtGYDslPvC8zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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