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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43cb63e12c88f7cca90c598734c1193eed9a07cb9ba6226fbc616c81d3ddf5e0' 
  AND token = 'kjkyGOOJFnQMtwPy4iQB3iYHfMANGneaWuVxs1jyvAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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