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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46630fc7685603af223d11bf7d9c1a8bfc19ef58b1ae458f15d7bd0853bd2e9d' 
  AND token = 'bxtu1uGMnwhaxYbQ2/APyJTEv16V03OCZwxcwQtsW0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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