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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648385bd1990cdc9de6515073f4349c1ed6b27e64fc5571a70a168fd4c3ec37d' 
  AND token = 'gsTgq8tNfzm8edOyfZek7/BEOr2up+x8x2i8hY0/evo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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