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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d06a35d0a5e89a532753bee8a18bd4fdbf57b8fe3a6bec13af32c8bbedfc9d' 
  AND token = 'LJgDgHceN7YgDoq6tNtLh6EhVotd393lnYbp3CuGPRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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