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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056007d23aba15baefcd766970ffd9718d2dce2a32929ee992d3b19663318c07' 
  AND token = 'Gkp/5FswquLAS/u/Py7kC7QhI6jlfj1MmN5w1ZHP9Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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