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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff784602f4c1fe4d3fc9e585578e50e4bbae69a10752f01af9353101777375d' 
  AND token = 'oUmt/0L99O6qqx3QU8P6bfQDpv46N5Ojc1O8dV9dWVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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