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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bde9266b6bb715f2e8fd4cd08a48460e39b868ca2a8b13d1af9b74e530e1c2' 
  AND token = 'Q/4lfVrevTajIuTi2Ag5HOVN0gVu+fl+IV3vw6QDMsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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