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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fb835c658cd39ed7f6acf71f7f63fff236af49969eee09ea1970b8a6882d35' 
  AND token = 'RxUU6Hs+cGvrVM6KeFjfSjn7HluD+9mbuHZIsDBdDoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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