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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f88504c147c59f3b7869372aa80bc1caaf630e624619fb49f639fb2abb9c31d' 
  AND token = 'FvWvasvGeAkNOlP7RPHn0q7x9S+vK/3aoc/DIZVXxQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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