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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e01dba5f1607559d0795f7d3d11d8d2b6cc42fc675aed28c2e81670a8df2749' 
  AND token = 'XoEgVLohzn7iZJ6sRKLT2Wys73E5QttFKUewU/nW0Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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